Lifestyle as a practical component in today's social analysis has a constructive 
effect on many citizens' social contacts. The aim of this research is to study the 
role of family lifestyle in the tendency of children and adolescents to drugs and 
psychotropic substances with emphasis on providing a developmental prevention 
model in Karaj city through descriptive-experimental methods. The statistical 
population is all children and adolescents under 18 in Karaj, who have been 
selected as the sample size using the Cochran's formula and using the sample 
sampling method of 400 people. The data collection tool is a researcher-made 
questionnaire in which the three main areas (lifestyle, the tendency to using 
drugs and growth prevention) are considered as closed and the Likert spectrum 
is used to measure them. Findings have shown that among the three types of 
lifestyles, Islamic lifestyle with a coefficient (0.60) has a greater effect on the 
developmental prevention and then the intermediate lifestyle is in the second 
place. In addition, developmental prevention with a negative coefficient (-0.53) 
has shown that it has the opposite effect on the tendency of children and 
adolescents to drugs and psychotropic substances. As a result, the tendency of 
children and adolescents to become addicted to drugs and psychotropic 
substances decreases with increasing developmental prevention.